Electric battery lamp



Feb. 8, 1938.

CHAN TING YU ALSO KNOWN AS T. Y. CHAN ELECTR I C BATTERY LAMP Filed July 21, 1956 5 Sheets-'Sheet l 4 inn 5..../

Feb. 8, 193

cHAN TING YU ALSO KNOWN As T. Y. CHAN ELECTRIC BATTERY LAMP I Filed July 21, 1956 5' sheets-sheet 2 Feb. 8, 1938. 2,107,599

l CHAN TlNG YU ALso KNOWN As T. Y. CHAN ELECTRI C BATTERY LAMP Filed July '21, 1956 3 Sheets-Sheet 5 Patented Feb.) 8, 1938 i t UNITED STATES PATENT OFFICE ELECTRIC BATTERY LAMP Chan Ting Yu lalso knownas T. Y. Chan, North Point, China f Application July 21, 1936, Serial No. 91,782

' In Great Britain July 31, 1935 This invention relates to electric battery lamps telescopically and the inner part of the casing and more especially t electric .'COI'ChBS, but S carries the bulb, reector, and controlling mechaalso' applicable to self-contained electric battery nism and the outer part carries the base 0f the lamps generally, whether intended for use in the battery casing and the inner portion of the telehand or upon a cycle or other vehicle or otherscopic casing is provided with a raised screw- 5 Wise. This invention has especial reference to thread so that an upper screw-thread on the lamps or torches of the kind in which the bulb outer portion can be screwed beyond the screwcarried by` a bulb socket can be Varied in its p0 thread on the inner portion and the outer portion sition relatively to the reflector for obtaining the can then be slid telescopically on the inner porl.0 desired focussing. tion until the vthread on the latter engages a An object of the present invention is the pro-A lower thread on the outer portion. vision of simple and accurate means for focus- The invention further comprises a variable resing the light beam of an electric torch in such sistance operated by a button movable transa way that the beam is capable of fine and exact versely of the casing, so that the voltage applied adjustment. tothe bulb may be varied. 15

As the required relative displacement of the The variable resistance may also be used as a -bulb and reflector for focussing purposes is very secondary or safety switch in case the main small, it is desirable to gear down the movement switch becomes short circuited or is inadvertently of the operating element in order to 'obtain the left in the on position.

required flneness ofadjustment. It has already The nature of the invention and a manner of o been proposedV to effect this by vconnecting the performing the same will be more fully underaxially slidable member of the reflector-bulbv stood from the following description of an emassembly with atransversely movable operating bodiment thereof with reference to the accomelement by means equivalent to a screw conpanying drawings, in which:-

nection.

The present invention comprises anY electric torch constructed according to the invention; torch or battery lamp having a bulb socket slid- Fig- 2 is a view of the same torch in central able along the opticalaxis for focussing purposes longitudinal section, showing the focussing and in which sliding movement is communicated mechanism with the focussing button in its lower to the bulb socket from an'external button slidposition and the extensible case and voltage 30 able on the casing in the direction of the optical regulator; axis by means of lever mechanism such that a Fig. 3 is a view similar to Fig. 2 with the given .displacement of Athe button produces a focussing -mechanism shown'in full instead of in small displacement of the bulb socket. section, and the focussing button in its upper Preferably the connection between the lever position; f 35 and the bulb socket includes cam means, e. g. a Fig. '4 is a view in section taken along the line ClllVed S1015 and Din- A-A of Fig. 3 and showing the focussing device; Another object of the present inventionl is to Fig. 5 is a partial view in section taken along provide means whereby the number of cells carthe line B-B of Fig. 4;

'4o-rieti in'an electric battery lamp may be altered Fig. 6 is a view similar to Fig. 2, showing the 40- to vary the voltage and capacity of the battery. casing extended to contain three cells instead A further object of the invention is the pro- 1 of two; and

vision of means for controlling 'the voltage ap- Fig. 7 is a view in section taken along the line plied to the lamp nlament so that a bulbv of low C-C of Fig. 6 and showing the voltage control voltage may be used with a battery of higher device. 45

voltage and -the life vof the bulb lengthened while Referring to the drawings, the torch comprises a more intense light maybe obtained for short the usual outer-screw-on-cap I,which locates the Periods. u i 4 lens 2 and the reflector 3 andwhich is screwed The invention therefore also comprises an elecon to the outside of the top of the upper part of tric 'torch or electric battery lamp having an thecasing portion l. An inner-screw-on-cap 5 50 extensible casing adapted to permit of increasing is screwed into the insideof the top end of casor decreasingits battery capacity, so thatl an extra ing 4. The inner cap 5 is recessed at th'e centre cell or' cells forming part of the circuit may be to receive the reflector 3 and they are both ininserted if requrei v sulated from a guide ring 6 through 'which passes Preferably the battery 'casing is extensible c a socket I8 carrying the vbulb I9. A cup-shaped 55 Fig. 1 is a view in elevation of lan electric 25* housing member 1 riveted'to the insi-:le of casing 4, and is madeof larger diameter at the top than at the bottom. The upper part houses another. separate cup-shaped housing member' 3. so

Ythat there are two oors', of which the upper constituted by the base of member 6, supports the.

' focussing meehanism.

A Ebre insulator plate 9 with all the focussing mechanism riveted thereon is riveted on to the top surface' of the base of member S. A brass plate I0 riveted to pIateS'has two bent up strips II, each provided with a hole or a pin I5, which formsa fulcrum for a two-armed lever I3. A sleeve I2 which has four. open-endedslots is riveted on tcthe brassplate I0 and serves as a guide for the bulb socket Il. iever I3 slides over the `outside of sleeve I2 'and the cross bar oonnectrig the arms thereof has formedthereon a projecting hinge pivot I4 through which the pin lpasses, thus the lever I3 is rockabie about the hinge I4, I5. In each arm cf the lever I3 there is a curved slot I6 located at the centre and a vhole I1 at the free end. The bulb socket IB is arranged to slide upand down inside the sleeve I2 and its upper end passes through ring 6 and through .thebase ofthe reiiector to receive the Ae' the side of the blub socket is. there a"v flexible wire 20, one en d of which is soldered to a bulb contact 2| and theother end toa brass strip 3 3'. 'I'he bottom of the bulb socket I3 carries two projecting brass pins 22, each passing through one of a pair of opposite slots in the sleeve I2 and into the curved slot I I5v of one of the` levert arms I3. lillovementof the bulb socket I6 is therefore .controlled by movement of lever I3. v

'y Movement of the lever I3 is caused by siding an external button 23 whose shank p-asses througha longitudinal slot 24 in the casing 4 and carries internally of the casing a brass washer 25, a

spring 26 and a cotter pin-21, whereby the button is lightly clamped the casing' 4 but can never- 'theless slide smoothly along slot 24.

The motion of thev shank of ythe button 2 3 is communicated to the lever I3 by means of a small bar offibre 28, which is centrally perforated at 29 to receive the shank of button 23 and the two ends 30 of the bar 23 are reduced so as to ilt into the two holes I1 of the lever I3, the connection so providedbetween the bar 23 and lever I3 being substantially frictionless. Theilight can be switched on and oif rby means of a shdable switch 43 in the usual way..

The lower end 'cf the casing portionv4 is screwthreaded at 44 and a lower-casing part `415 is screw-threaded at the top 46 and near the bottom at 41 and its extreme lowerfend is screwed at 43 into "the bottom-screw-on-.cap v which carries a brass housing-60 containing acontact'membcr 4! which is inherently springy or is loadedv by a spring (not shown) and is operative to hold the vcells in their correct' positions. Theoperation of this extensible casingisas followsioifthree' cells are to b'e inserted, the' thread 44 of" part I4 s is engaged with thread". If on the other'hand' .only two cells are required 'the thread' 4 3 "of the -lower casing 45 is screwed 'beyond the thread 44 of the uppercasing 4 andthe tv io parts'-tele'scope\f` Y together until thread-44 engages thread 4 1. 's

The v .olt'age appned tdtnebmb is regulated by means of a butt-cn 4l sliding in atransverse slot@ 4t of the casing L4 aid attached toa rotary discv 32 made ofinsulatin'g material and centred ons brass nut 36' and whichcarriesa wiper arm' 3 1 making contact with the resistance coil I f wound a selected position.

on an arcuate former 3|'y als-o made of insulating of two brass, strips ==3 and 34 riveted to the base of an insulating member 1' contained in the housing 1 secured within the casing 4, the strip 33 being electrically connected withone end of the coli 3l. Y I 7 In circuit with the battery 42 is a contact screw 36 which has a hollow shank and is threaded internally and externally and projects upwards throughl the base of member 1 `where it is retained by the nut 36', the disc 32 and wiper arm 31 being material, which is cured at each end by means located by the screw 39, which screws into the shank of the screw 36 and keeps the wiper arm 31 in contact with coil 3l Y''he other ends of the brass strips 33 and 34 enter the housing member 8 ttirig within the member 1 and the end 33' of member 33 isconnected to the exible vwire 20 as already stated and the 'end 34' of the member 34 is connected to the brass plate 10, the 'strip 34 being also con.

switch l nected through a spring andthe slidable -43 vwith the casing 4.

' What I claim isz- 1. An electric battery lamp ofthe kind in which the bulb is slidable along the optical axis for focussing purposes and including s. casing, a slidable bulb socket, an external button axially slidable on the casing and having a shank projecting.'

within the casing, a crossbar on said shank, lever means engaging said socket and comprising two parallel arms disposed on either side |thereof, the

ends ofv said crossbar engaging pivotallyin theaxis for focussing purposes and including a slidl able bulb socket, lever means pir-fated` transversely ofthe optical axis and` comprisingtwo' parallel lever arms, curvedi-slotsin Vsaid lever arms, pins mounted on said socket and engaging said curved 5'0 slots, asleeve member in which the said socket is slidabls, 'said'sleeve memberhaving guide slots parallel to the optical axis, said slots engaging said pins to prevent the socket from rotating, and means for manually actuating'the said lever means.

s. In an electric battery. lamp according to claim 1,'9. snankintsgrai with vthe mentiened external button and projecting within the casing and having means engaging the mentioned lever means, 4a flanged sleeve .surrounding said shank` and spring means engaging the ange of said' sleeve and pressing the same against.'y the inner wall of the casing to clamp the external button in 6. In an electrlc` battery iamp" to -claim' 1, a'shank integral with the mentioned ex \ternal button and projecting within the casingmeans, a flanged-sleeve surrounding said shank and s'helical spring surrounding said sleeve and engaging the flange thereof andpressing the same against the inner wall of the casing to clamp th external button in a position. l

-7. Anv electric batterylamp exten-l and having rneans engaging the mentioned lever capacity byl the'insertion or withdrawal of at least one dry battery cell, said extensible casing comprising an inner and an outer member telescopically interengaged, said outer casing member having an open and a closed end and including a. screw-threaded portion 'at each end and said inner casing member having an open and a closed end and including at its open end a screwthreaded portion which is engageable alternatively with.one or the other of the two screwthreaded portions of the outer casing part and is raised from the non-screw-threaded surface of the remainder of the inner casing member to permit the screw-threaded portion at the open end of the outer casing part to be screwed beyond the threaded portion of the inner casing member and allow the said casing members to be slid telescopically on one another until the screwthreaded portion adjacent the closed end of the outer casing member engages the screw-threaded portion of the inner casing member.

`8. In an electric 'battery lamp having an incandescent bulb and a casing, variable resistance means for regulating the voltage applied to they land an external button movable transversely of the casing for actuating s aid'm'ovable contact. 9. In an electric battery lamp as claimed in claim 8, a disc carrying the mentioned movable v contact, a shank mounted on said disc and terminating in the mentioned external button and a transverse slot in the casing through which said shank projects. y

l0. An electric battery lamp having an extensible casing permitting the increasing or decreasing of the battery capacity by the insertion or withdrawal of at least one dry battery cell, said Y casing comprising inner and outer tubular members arranged to be slidable telescopically relatively to each other, one of said members having stations along the length of the last named member and alternatively engageable with the integral engaging device of the rst named member to secure said members ltogether in positions corresponding to the' number of cells it is desired to use, a base part mounted on one of said casing members and a bulb socket, reilector and controlling mechanism mounted in the other casing member.

T. Y. CHAN. 

